The Robust glass machine is used to create robust glass from red sandstone obtained from the Oo'glog and Sophanem red sandstone mines. It belongs to a dwarf named Rutmir Arnhold. It is located just southwest of the mud bath in Oo'glog.
With the release of Prifddinas, a robust glass machine was made available for use in the Ithell Clan district. This machine can be used just like the one in Oo'glog, but can also turn crystal-flecked sandstone into crystal glass.